EP0032391B1 - Dispositif de pulvérisation de peinture liquide - Google Patents

Dispositif de pulvérisation de peinture liquide Download PDF

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Publication number
EP0032391B1
EP0032391B1 EP81100134A EP81100134A EP0032391B1 EP 0032391 B1 EP0032391 B1 EP 0032391B1 EP 81100134 A EP81100134 A EP 81100134A EP 81100134 A EP81100134 A EP 81100134A EP 0032391 B1 EP0032391 B1 EP 0032391B1
Authority
EP
European Patent Office
Prior art keywords
deflecting member
bell
overflow surface
paint
canaliculi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81100134A
Other languages
German (de)
English (en)
Other versions
EP0032391A1 (fr
Inventor
Kurt Vetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0032391A1 publication Critical patent/EP0032391A1/fr
Application granted granted Critical
Publication of EP0032391B1 publication Critical patent/EP0032391B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member
    • B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1092—Means for supplying shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell

Definitions

  • the invention relates to a device for atomizing liquid paint, in particular a paint sprayer, with an atomizer bell rotatable about a central axis, which has an annular, coaxial overflow surface on its axially front end face and a central axial breakthrough at its base and is provided with a rotationally symmetrical deflection part above the base is, which faces the opening with the back of its center and is adjacent with its radially outer edge of the overflow surface, the gap between the deflecting part and the bottom being connected to the overflow surface in a liquid-conducting manner; and with a nozzle located at the free end of the coaxial ink supply tube, which protrudes into the intermediate space and opens out towards the center of the deflecting part, the deflecting part having a coaxial inlet opposite the nozzle opening and a coaxial outlet on the front side of the deflecting part; wherein the front of the deflecting part forms an annular coaxial surface; and wherein at least one side of the deflecting part forms an overflow
  • the deflection part (3) is only provided on its rear side with an overflow surface, so that a partial flow of the paint through the openings (7) onto the overflow surface (8) of the bell (6) flows.
  • the rest of the paint emerging from the nozzle (2) is in a conical shape through the central passage opening (4) of the hub (3a) of the deflection part (3), in which there is a guide cone (5) directed towards the nozzle (2) Particle jet sprayed onto the object to be dusted with paint without radial deflection.
  • a disadvantage of the deflecting part of the known device is that particles of the paint atomized into mist reach the front side of the deflecting part by suction, where they are not thrown off, if the paint contains a volatile solvent which, after painting, evaporates after the paint has been atomized or evaporates and the paint adheres to the front of the deflecting part. Even with watery colors, fog droplets settle on the front of the deflecting part, which are not thrown off due to drying due to water evaporation. These color particles remaining on the front of the deflection part must be removed before a color change, which is not the case with the device known from DE-A-1 577 874 (FIG.
  • agglomerates are formed on the front of the deflection part of the known device from metal particles, which adhere due to the particularly high volatility of the solvent and the effectiveness of the binder. These agglomerates are removed here and there and thrown centrifugally against the front overflow surface of the atomizer bell, where they get into the paint stream and finally onto the object to be sprayed with paint, where they form disturbing defects in the paint.
  • the invention is therefore based on the object of avoiding the disadvantages described and, moreover, of creating a device of the type mentioned at the outset which prevents the formation of harmful agglomerates from metal particles and reduces the effort required for changing the color.
  • the deflecting part is provided with an overflow area on both its rear side and on its front side, so that a bypass flow of paint at the edge of the front overflow area into that on the front overflow area the bell flowing main stream of paint originating from the rear overflow surface, and for this purpose has a cannula labyrinth in the center between its inlet and outlet with several, evenly distributed needle cannulas, which radially deflect the admitted side stream of paint and a bore as an outlet of the deflection part respectively.
  • the radially outer edge of the front overflow surface of the deflection part and the radially inner edge of the front overflow surface of the bell are flush and are continuously separated from one another in the circumferential direction.
  • the secondary flow of the paint can therefore flow smoothly into the main flow everywhere.
  • the atomizer bell is provided with a fastening part integrally formed on the radially outer edge of the deflecting part for fastening the deflecting part to the radially inner periphery of the bell, wherein essentially radial channels starting from the intermediate space are formed at the transition from the deflecting part to the fastening part an annular cavity is formed, into which the tubules open and which is formed by an annular gap between Bell and deflecting part at the meeting point of the adjacent edges of the front or front overflow surfaces of the bell and the deflecting part opens into the open.
  • the embodiment of the device according to the invention which can be fastened to a frame by means of a rod 10, mainly consists of a rotating atomizer bell 12, a hollow shaft 14 which supports the bell with its front end in a rotationally fixed manner, and a pneumatically operated motor 16 for driving the shaft a blowing device 18, a paint feed device 20 and a pneumatic cylinder-piston unit 22 for actuating a valve 24 of the paint feed device.
  • the one-piece atomizer bell 12 for example made as a turned part made of aluminum, in turn consists of a circular disk-shaped base 26 forming its base 28 with an internally threaded bore 30 as the central opening, and a ring 32 with a circular cylindrical opening formed onto the edge of the base 26 to the front 34, which ends at the base 28 lying in a radial plane and has a forwardly diverging, cone-shaped bevel 36 on its axially front edge, from an integrally formed on the ring 32, axially forwardly projecting, annular lip 38, the edge of which many small , Evenly distributed on the circumference, internal grooves 40, and from a starting at the bevel 36, ending at the grooves 40, i.e.
  • annular overflow surface 42 the profile of which is about half of a straight line beginning at the bevel 36 and out an arc ending at the grooves 40 is composed.
  • the straight profile section results in an extremely slightly axially converging inner ring surface and the circular arc-shaped profile section results in a tangentially positioned, axially decreasing diverging ring surface that complements the overflow surface 42.
  • the atomizer bell 12 is screwed with its threaded bore 30 onto the front end of the hollow shaft 14, which is provided with an external thread, and is tightened for a rotationally fixed connection with its base 26 against a stop ring 44, which is axially stuck on a thread-free section of the hollow shaft 14.
  • a coaxial paint feed pipe 46 of the paint feed device 20 runs without contact within the hollow shaft 14, which also includes a nozzle 48, which is partially screwed into the paint feed pipe 46 ending at the bottom 28 of the bell 12 and sealed and a conical valve seat 50 of the valve 24 inside the pipe end of the device 20, the valve body of which forms the frustoconical tip 52 of a valve actuating needle. 54, which lies with all-round radial play in the ink supply tube 46 and forms an annular ink supply channel 56 with it.
  • the atomizer bell 12 is provided with a deflecting part 58, which deflects the ink flow emerging axially from the nozzle 48 in all radial directions and divides it into a main flow flowing on its rear side and a partial flow flowing on its front side, which should be approximately a quarter of the total flow.
  • This deflecting part 58 essentially has a flat circular disk 60 with a central hub 62.
  • the circular disk 60 has on its outer edge an axially diverging, conical jacket-shaped circumferential surface 64, the opening angle of which exactly matches the opening angle of the bevel 36, so that it forms a constantly wide annular gap 66 with the circumferential surface 64.
  • the front side of the circular disk 60 represents an overflow surface 68 of the deflection part 58 which is extremely weakly converging axially to the rear and which merges smoothly and without kinking into the overflow surface 42 of the bell 12 at the annular gap 66 in its mouth plane.
  • the rear side of the deflecting part 58 which receives the main flow of the color, is formed by the conical hub 62 outside the circular disk 60, in which it is essentially cylindrical, and by a surface 70 of the circular disk 60 lying mainly outside in a radial plane.
  • the axially rearward-pointing tip of the hub 62 lies at a distance from the mouth of the nozzle 48, into the free cross-section of which it projects.
  • An axial bore 72 of the hub 62 which begins at its tip, is the inlet of a cannula labyrinth 74 of the deflection part 58, which has on its front side a coaxial depression 76 with an inner shoulder 78, on which an insert ring 80 adapted to the depression 76 with a bore 82 rounded at its front edge lies, which forms the axial outlet of the cannula labyrinth 74.
  • the insert ring 80 forms with the bottom of the recess 76 an annular space 84 of the cannula labyrinth 74, to which straight needle cannulas 86 still diverging axially towards the front belong, which on the one hand into the hub bore 72 and on the other hand open into the annular space 84.
  • a fastening part 88 is integrally formed on the edge of the deflection part 58, which has an elastic retaining ring 90 with a trapezoidal cross-section, which is encompassed radially or axially on one side by the opening 34 and the base 28 of the atomizer bell 12, and which has the intermediate space 92 between the circular disk 60 of the deflection part 58 and the bottom 28 of the bell 12 includes.
  • annular groove 96 in the fastening part 88 from the ring 32 of the bell 12 closed cavity is formed, which communicates with the intermediate space 92 via many, evenly distributed over the circumference of the circular disk 60, radial channels 98, which are arranged at the transition from the fastening part 88 to the deflecting part 58 on its rear surface 70.
  • the pneumatic motor 16 for driving the hollow shaft 14 has a turbine impeller 100 with rotor blades 102 which are acted upon by compressed air which emerges from radial nozzles 104.
  • the blowing device 18 has a line 106 for supplying compressed air, which ends in an annular chamber 108, which is provided on its end face with a plurality of axially parallel nozzles 110, which are distributed uniformly over the circumference of the stop ring 44 and which face the ring 32 of the atomizer bell 12 open into the open.
  • the compressed air exiting there in the form of steering air in conjunction with an electrostatic device, deforms the radial jet formed when the paint is atomized into a round or ring jet with an axial main component.
  • the ink supply device 20 is shown in a highly simplified manner by being restricted to one color.
  • the device could be a multi-color atomizer.
  • a suction device is required which, when changing the color, vacuums the ink supply channel 56 ending at the valve 21 before the next color is sprayed.
  • the unit 22 is double-acting. Its piston rod is firmly connected to the valve actuation needle 54.
  • the mode of operation of the described device results from its structure and the functions of its individual parts.

Claims (8)

1. Dispositif pour vaporiser une matière colorante liquide, notamment pulvérisateur de peinture, comportant une cloche de pulvérisation (12) pouvant tourner autour d'un axe central et qui comporte une surface annulaire coxiale d'étalement (42) sur sa face frontale avant du point de vue axial et un perçage axial central (30) au niveau de son fond (28), et est équipé, au-dessus de ce fond (28), d'une partie formant déflecteur (58) à symétrie de révolution, dont la face arrière de sa zone centrale (62) est disposée en vis-à-vis du perçage (30) et qui, par son bord extérieur du point de vue radial est voisine de la surface d'étalement (42), l'espace intercalaire compris entre la partie formant déflecteur (58) et le fond (28) étant relié d'une manière permettant le guidage du liquide, à la surface d'étalement (42), et comportant une buse (47) montée sur l'extrémité libre du tube coaxial (46) de guidage de la matière colorante et qui fait saillie dans l'espace intercalaire et débouche en vis-à-vis de la zone centrale (62) de la partie formant déflecteur (52), et dans lequel la partie formant déflecteur (58) comporte dans sa zone centrale (62) une admission coaxiale (72) disposée en vis-à-vis de l'ouverture de la buse, et une surface coaxiale (82) située sur la face avant de la partie formant déflecteur (58), et dans lequel la face avant de la partie formant déflecteur (58) forme une surface annulaire coaxiale (68) et dans lequel au moins une face de la partie formant déflecteur (58) forme une surface d'étalement (68 ou 70) prévue pour la circulation étalée d'un éventuel écoulement partiel de la matière colorante, caractérisé par le fait que la partie formant déflecteur (58) est munie, aussi bien sur sa face arrière que sur sa face avant, de surfaces respectives d'étalement (68 et 70) de telle sorte qu'un écoulement secondaire de la matière colorante sur le bord de la surface avant d'étalement (68) débouche dans l'écoulement principal, circulant sur la surface frontale d'étalement (42) de la cloche (12) et provenant de la surface arrière d'étalement (70), et que ladite partie formant déflecteur comporte en outre, dans sa zone centrale (72), entre son admission et sa sortie (72 ou 82) un labyrinthe à canules (74) possédant plusieurs canules de projection (86) réparties uniformément et qui dévient radialement l'écoulement secondaire introduit de la matière colorante et l'envoient à un perçage (82) servant de sortie pour la partie formant déflecteur (58).
2. Dispositif suivant la revendication 1, caractérisé par le fait que le bord extérieur du point de vue radial de la surface avant d'étalement (68) de la partie formant déflecteur (58) ainsi que le bord inférieur du point de vue radial de la surface frontale d'étalement (42) de la cloche (12) sont de niveau et sont séparés l'un de l'autre, sans interruption suivant la direction périphérique.
3. Dispositif suivant la revendication 2, caractérisé par le fait que la cloche de pulvérisation (12) est équipée d'un organe de fixation (88) réalisé d'un seul tenant par façonnage sur le bord extérieur du point de vue radial de la partie formant déflecteur (54) et servant à fixer cette partie sur le pourtour intérieur du point de vue radial (34) de la cloche, tandis que des petits canaux (98) essentiellement radiaux et partant de l'espace intercalaire sont réalisés au niveau de la jonction entre la partie formant déflecteur et l'organe de fixation (58 et 88) et qu'une cavité annulaire (87) est formée, dans laquelle les petits canaux (98) débouchent et qui débouche à l'extérieur par l'intermédiaire d'une fente annulaire (66) entre la cloche (12) et la partie formant déflecteur (72), au niveau du point de rencontre des bords voisins des surfaces frontales ou avant d'étalement (42, 68) de la cloche et de la partie formant déflecteur (58).
4. Dispositif suivant la revendication 3, caractérisé par le fait qu'il est prévu dans l'organe de fixation (88), comme cavité annulaire, une gorge annulaire (87) fermée par la cloche (12).
5. Dispositif suivant l'une des revendications 1 à 4, dont ia partie formant déflecteur (58) est essentiellement un disque circulaire (60) comportant un moyeu central (62) qui fait saillie en direction de la buse (48), caractérisé par le fait que le moyeu (62) contient le labyrinthe à canules (74).
6. Dispositif suivant l'une des revendications 1 à 5, caractérisé par le fait que la partie formant déflecteur (68) comporte, sur sa face avant, un renfoncement étagé (76), essentiellement cylindrique, comportant un épaulement intérieur (78), sur lequel prend appui une bague rapportée (80) dont le perçage central (82) arrondi sur l'avant constitue la sortie du labyrinthe à canules (74) et qui, sur l'avant, se raccorde de niveau avec la surface avant d'étalement (68) de la partie formant déflecteur.
7. Dispositif suivant la revendication 6, caractérisé par le fait que l'admission du labyrinth à canules (74) est réalisée dans le moyeu (62) sous la forme d'un perçage coaxial (72) qui est relié par l'intermédiaire des canules de projection (86) à un espace annulaire (84) ménagé dans le fond du renfoncement (76) de la partie formant déflecteur (58) en arrière de l'anneau rapporté (80).
8. Dispositif suivant l'une des revendications 1 à 7, caractérisé par le fait que le labyrinthe à canules (74) muni de l'admission et de la sortie (72 et 82) est dimensionné de telle manière que l'écoulement secondaire de la matière colorante peut être réglé à une valeur comprise entre un cinquième et un tiers de l'écoulement total traversant la buse (48).
EP81100134A 1980-01-15 1981-01-10 Dispositif de pulvérisation de peinture liquide Expired EP0032391B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3001209A DE3001209C2 (de) 1980-01-15 1980-01-15 Vorrichtung zum Vernebeln flüssiger Farbe, insbesondere Lackzerstäuber
DE3001209 1980-01-15

Publications (2)

Publication Number Publication Date
EP0032391A1 EP0032391A1 (fr) 1981-07-22
EP0032391B1 true EP0032391B1 (fr) 1984-04-18

Family

ID=6092060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100134A Expired EP0032391B1 (fr) 1980-01-15 1981-01-10 Dispositif de pulvérisation de peinture liquide

Country Status (5)

Country Link
US (1) US4405086A (fr)
EP (1) EP0032391B1 (fr)
JP (1) JPS56102958A (fr)
DE (1) DE3001209C2 (fr)
ES (1) ES8200239A1 (fr)

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JPS6140468B2 (fr) 1986-09-09
ES498489A0 (es) 1981-11-01
US4405086A (en) 1983-09-20
JPS56102958A (en) 1981-08-17
ES8200239A1 (es) 1981-11-01
DE3001209A1 (de) 1981-07-23
EP0032391A1 (fr) 1981-07-22
DE3001209C2 (de) 1985-07-25

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